In the Australian first innings, the 19-year-old debutant appeared to have been just caught short of his ground on six when a stumping decision was referred to third umpire Marais Erasmus. Erasmus gave Agar, the No. 11 batsman, a reprieve, allowing him to go on and make 98. (Photo: Getty Images)

Jonathan Trott

The Zimbabwean umpire Erasmus was again under the spotlight after he overturned Aleem Dar's decision not to give out Trott (left) LBW for a first ball duck. Replays seem to suggest an inside edge but with the Hot Spot technology absent, the third umpire sent Trott on his way. (Photo: Reuters)

Stuart Broad

During the England second innings, Broad stood his ground after his thick edge went off wicket-keeper Haddin's gloves and to Clarke at slip. Dar was unmoved, but Australia had used up all their challenges and Broad stayed. (Photo: Getty Images)

Shane Watson

Watson was given LBW to Stuart Broad but decided to review what looked a marginal call. Hawkeye showed the ball to be clipping leg-stump and it went with the on-field decision. Watson left the field cursing as Hawkeye showed only a fraction of the ball hitting the stumps. (Photo: Reuters)

Michael Clarke

Clarke was given out caught behind and he asked for a review which showed the tiniest of nicks on the infra-red. Clarke had to go for 23 despite using the last challenge after Broad launched an appeal for caught behind to Matt Prior when umpire Aleem Dar gave him out after checking with the TV umpire. (Photo: Getty Images)

Brad Haddin

The final wicket too involved a referral. With neither Anderson nor 'keeper Prior appearing too convinced of a slight inside edge, Cook opted to gamble and a slight nick gave England the result. This time, DRS gave the correct verdict. (Photo: Reuters)

Brad Haddin

The final wicket too involved a referral. With neither Anderson nor 'keeper Prior appearing too convinced of a slight inside edge, Cook opted to gamble and a slight nick gave England the result. This time, DRS gave the correct verdict. (Photo: Reuters)